This page contains a forever growing list of usefull Powershell cmdletts that I regularly use with Skype for Business.
Get members of a Skype for Business Pool
Get-CsPool -identity frontendpoolFQDN | select -expandproperty computers
Get the status of Windows Fabric for a pool
Get-CsPoolFabricState -PoolFqdn frontendpoolFQDN